Take-up mechanism for looms



July 31, 1923- J. NORTHROP TAKE-UP MECHANISM FOR LOOMS Filed July 20. 1922 Patented .ly 31, 192}.

FACTURING COMPANY, OF MILFORD, MASSACHUSETTS,

TAKE-UP MEG a coarona'rron on em roa Looms.

Application filed July 20, 1922. Serial No. 576,291.

T all whom it may concern:

Be it known that I, JONAS NOR'1I1ROP, a citizen of the United States residing at Hopedale in the county of Worcester and State of Massachusetts, have invented certain new and useful Improvements in Take- Up Mechanism for Looms; and I do hereby declare the followin to be a full, clear, and exact description 0 the invention, SllOlhfiS will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to an 1mprovement in take up mechanlsm for looms.

In looms as ordinarily constructed, the

cloth being woven passes over a breast beam or sand roll and is wound u on the cloth roll, mechanism being provi ed for actuating the sand roll to wind up the cloth, having provision for lettin back the cloth upon weft replenishment. uch letting back of the cloth will take place due to the tension on the warp under certain conditions of operation, as when there is considerable warp tension, but it sometimes happens that the warp tension is insuflicient to pull back the cloth, and in such case a thin place occurs. The object of the present inventlon is to provide a device for feeding the cloth back when replenishment takes place, so as -to avoid a thin place in the fabrlc, wlnch would be caused by the omission of a weft.

To the above end, the resent invention consists in the take u mec anism for looms hereinafter describe and particularly defined in the claims.

In the accompanying drawings illustrating the preferred embodiment of the invention, Fi 1 is a front elevation of the right hand end of the loom; F1 2 is a secto tion on line 2-2 of Fig. 1; an Fig. 3 1s a sectional elevation showing the driving connections for the sand or wind up roll.

Referring to the drawings, the cloth 10 is wound upon a wind up roll 12 yieldingly 4 maintained against a draw roll 13 so as to be frictionally driven thereby. The draw roll 13 is positively rotated from the usual cam shaft of the loom, not shown, in any desired manner, referably by the gear train,

worm and sha driven from the cam shaft,

as illustrated and described in my co-pending application, Serial No. 316,549, and as shown in Fig. 3. The wind up roll is supported on the slides 14 which descend as the size of the wind 11 roll increases. The draw roll 13 is provi ed at 15 with a smooth surfaced drum over the surface of which the brake and pull back strap 16 is arranged. One end of the strap '16 is attached to the hook 17. This hook has a shank which passes freely through a hole in the bracket 18 and receives u on its end the adjustin and set nuts 19. spring 20 normally ten to hold the hook in a position with the adustmg nut below the lower surface of the bracket 18. The other end of the strap 16 s attached to the spring 21 which connects t to the bracket 18. In the regular workng of the loom the draw roll 13 is rotated in the usual manner and it pulls upon the strap 16, thereby lifting the hook 17 until the adjusting nuts 19 strike the under side of the bracket 18 or until the strap slips on the drum, whereupon the hook stands fast and the strap no longer follows the draw roll If, now, the take up is disengaged, the sprmg 20 tends to rotate the draw roll to give up some of the cloth which it has drawn through the loom, thereby movin the fell toward the lay and preventing t e occurrence of a thin place in the cloth. The sprin 21 has less strength than the spring 20 an the movement of the strap is accomplished in this manner.

It is immaterial what sort of take up mechanism be used on the loom and whether or not the device of the present invention is employed in connection with a sand roll or a draw roll, or otherwise, so long as it operates to tend to rotate the cloth pulling element in a direction to cause it to move the fell toward the l-ay.

Having thus described the invention, what is claimed is:

1. A loom having, in combination, a wind up roll, means for driving the same to wind up the cloth, means for disconnecting said driving means, a friction strap resisting rotation of the wind up roll connected at its ends to springs, one of such springs tending to resist the rotation of the wind up roll. and to wind back the cloth when permitted so to do. a

2. A loom having, in combination, a wind up roll, means for driving it to wind up the cloth, means for disconnecting said drlving means,v a friction strap connected with the wind up roll for acting on the wind up roll for preventing motion of the strep in the to resist rotation of the some in the direction to Wind up the cioth,nnyieiding menns wind up direction with the roll beyond a fixed point, and springs connected to eeoh end of the strap.

3. A loom having, in combination, e wind up roll means for driving it to Wind up the cloth heving provision for disconnection therefrom, n friction device for acting on the wind up roil heving provision for yielding with the Wind up roll in a, direction of its Wind up motion to e certnin limit, and

neeeneo for yieidin in the opposite direction Without n fixed .ml

42. A. loom having, in comhinntion, e Wind up roll, means for driving it to Wind up the cloth, heaving provision for disconnection therefrom, friction means connected with the Wind up roll aetin yieldingly to resist the motion of the wind up roll in both directions end to turn it hnchvvnrd upon the disconnection of the Wind up roll from its driving mechanism.

JQNAS NRTHRP 

